The Court Line aircraft had 119 seats with back to back seats by the overwing exits to speed evacuation.
I witnessed the evac test in the flight shed at Hurn. I volunteered to be a pax but there were too many people so I just watched.
Each pax had a numbered vest and was told which exit to use.
It took 3 attempts to get everyone out in the required 90 seconds with the allocated exit being changed for some.
All young, fit apprentices and the like, so not very realistic, but the test was passed.